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authorElie Roux <elie.roux@telecom-bretagne.eu>2013-04-23 07:24:49 -0700
committerElie Roux <elie.roux@telecom-bretagne.eu>2013-04-23 07:24:49 -0700
commit63ee07f1f4021d07c5d89b706f2a9f1d8a4d97c9 (patch)
tree44ad64b7785d86d3ad47a1a2032e22f0c866c042 /otfl-font-otn.lua
parent9291e1983240e72d93815a096963dc28a7acd770 (diff)
parent80ab69f3c89c4ee576310e073510f286ad0f3b66 (diff)
downloadluaotfload-63ee07f1f4021d07c5d89b706f2a9f1d8a4d97c9.tar.gz
Merge pull request #1 from phi-gamma/master
Updating with current master
Diffstat (limited to 'otfl-font-otn.lua')
-rw-r--r--otfl-font-otn.lua2712
1 files changed, 0 insertions, 2712 deletions
diff --git a/otfl-font-otn.lua b/otfl-font-otn.lua
deleted file mode 100644
index 8e67597..0000000
--- a/otfl-font-otn.lua
+++ /dev/null
@@ -1,2712 +0,0 @@
-if not modules then modules = { } end modules ['font-otn'] = {
- version = 1.001,
- comment = "companion to font-ini.mkiv",
- author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
- copyright = "PRAGMA ADE / ConTeXt Development Team",
- license = "see context related readme files"
-}
-
--- this is still somewhat preliminary and it will get better in due time;
--- much functionality could only be implemented thanks to the husayni font
--- of Idris Samawi Hamid to who we dedicate this module.
-
--- in retrospect it always looks easy but believe it or not, it took a lot
--- of work to get proper open type support done: buggy fonts, fuzzy specs,
--- special made testfonts, many skype sessions between taco, idris and me,
--- torture tests etc etc ... unfortunately the code does not show how much
--- time it took ...
-
--- todo:
---
--- kerning is probably not yet ok for latin around dics nodes
--- extension infrastructure (for usage out of context)
--- sorting features according to vendors/renderers
--- alternative loop quitters
--- check cursive and r2l
--- find out where ignore-mark-classes went
--- default features (per language, script)
--- handle positions (we need example fonts)
--- handle gpos_single (we might want an extra width field in glyph nodes because adding kerns might interfere)
--- mark (to mark) code is still not what it should be (too messy but we need some more extreem husayni tests)
-
---[[ldx--
-<p>This module is a bit more split up that I'd like but since we also want to test
-with plain <l n='tex'/> it has to be so. This module is part of <l n='context'/>
-and discussion about improvements and functionality mostly happens on the
-<l n='context'/> mailing list.</p>
-
-<p>The specification of OpenType is kind of vague. Apart from a lack of a proper
-free specifications there's also the problem that Microsoft and Adobe
-may have their own interpretation of how and in what order to apply features.
-In general the Microsoft website has more detailed specifications and is a
-better reference. There is also some information in the FontForge help files.</p>
-
-<p>Because there is so much possible, fonts might contain bugs and/or be made to
-work with certain rederers. These may evolve over time which may have the side
-effect that suddenly fonts behave differently.</p>
-
-<p>After a lot of experiments (mostly by Taco, me and Idris) we're now at yet another
-implementation. Of course all errors are mine and of course the code can be
-improved. There are quite some optimizations going on here and processing speed
-is currently acceptable. Not all functions are implemented yet, often because I
-lack the fonts for testing. Many scripts are not yet supported either, but I will
-look into them as soon as <l n='context'/> users ask for it.</p>
-
-<p>Because there are different interpretations possible, I will extend the code
-with more (configureable) variants. I can also add hooks for users so that they can
-write their own extensions.</p>
-
-<p>Glyphs are indexed not by unicode but in their own way. This is because there is no
-relationship with unicode at all, apart from the fact that a font might cover certain
-ranges of characters. One character can have multiple shapes. However, at the
-<l n='tex'/> end we use unicode so and all extra glyphs are mapped into a private
-space. This is needed because we need to access them and <l n='tex'/> has to include
-then in the output eventually.</p>
-
-<p>The raw table as it coms from <l n='fontforge'/> gets reorganized in to fit out needs.
-In <l n='context'/> that table is packed (similar tables are shared) and cached on disk
-so that successive runs can use the optimized table (after loading the table is
-unpacked). The flattening code used later is a prelude to an even more compact table
-format (and as such it keeps evolving).</p>
-
-<p>This module is sparsely documented because it is a moving target. The table format
-of the reader changes and we experiment a lot with different methods for supporting
-features.</p>
-
-<p>As with the <l n='afm'/> code, we may decide to store more information in the
-<l n='otf'/> table.</p>
-
-<p>Incrementing the version number will force a re-cache. We jump the number by one
-when there's a fix in the <l n='fontforge'/> library or <l n='lua'/> code that
-results in different tables.</p>
---ldx]]--
-
--- action handler chainproc chainmore comment
---
--- gsub_single ok ok ok
--- gsub_multiple ok ok not implemented yet
--- gsub_alternate ok ok not implemented yet
--- gsub_ligature ok ok ok
--- gsub_context ok --
--- gsub_contextchain ok --
--- gsub_reversecontextchain ok --
--- chainsub -- ok
--- reversesub -- ok
--- gpos_mark2base ok ok
--- gpos_mark2ligature ok ok
--- gpos_mark2mark ok ok
--- gpos_cursive ok untested
--- gpos_single ok ok
--- gpos_pair ok ok
--- gpos_context ok --
--- gpos_contextchain ok --
---
--- todo: contextpos and contextsub and class stuff
---
--- actions:
---
--- handler : actions triggered by lookup
--- chainproc : actions triggered by contextual lookup
--- chainmore : multiple substitutions triggered by contextual lookup (e.g. fij -> f + ij)
---
--- remark: the 'not implemented yet' variants will be done when we have fonts that use them
--- remark: we need to check what to do with discretionaries
-
--- We used to have independent hashes for lookups but as the tags are unique
--- we now use only one hash. If needed we can have multiple again but in that
--- case I will probably prefix (i.e. rename) the lookups in the cached font file.
-
-local concat, insert, remove = table.concat, table.insert, table.remove
-local format, gmatch, gsub, find, match, lower, strip = string.format, string.gmatch, string.gsub, string.find, string.match, string.lower, string.strip
-local type, next, tonumber, tostring = type, next, tonumber, tostring
-local lpegmatch = lpeg.match
-local random = math.random
-
-local logs, trackers, nodes, attributes = logs, trackers, nodes, attributes
-
-local registertracker = trackers.register
-
-local fonts = fonts
-local otf = fonts.handlers.otf
-
-local trace_lookups = false registertracker("otf.lookups", function(v) trace_lookups = v end)
-local trace_singles = false registertracker("otf.singles", function(v) trace_singles = v end)
-local trace_multiples = false registertracker("otf.multiples", function(v) trace_multiples = v end)
-local trace_alternatives = false registertracker("otf.alternatives", function(v) trace_alternatives = v end)
-local trace_ligatures = false registertracker("otf.ligatures", function(v) trace_ligatures = v end)
-local trace_contexts = false registertracker("otf.contexts", function(v) trace_contexts = v end)
-local trace_marks = false registertracker("otf.marks", function(v) trace_marks = v end)
-local trace_kerns = false registertracker("otf.kerns", function(v) trace_kerns = v end)
-local trace_cursive = false registertracker("otf.cursive", function(v) trace_cursive = v end)
-local trace_preparing = false registertracker("otf.preparing", function(v) trace_preparing = v end)
-local trace_bugs = false registertracker("otf.bugs", function(v) trace_bugs = v end)
-local trace_details = false registertracker("otf.details", function(v) trace_details = v end)
-local trace_applied = false registertracker("otf.applied", function(v) trace_applied = v end)
-local trace_steps = false registertracker("otf.steps", function(v) trace_steps = v end)
-local trace_skips = false registertracker("otf.skips", function(v) trace_skips = v end)
-local trace_directions = false registertracker("otf.directions", function(v) trace_directions = v end)
-
-local report_direct = logs.reporter("fonts","otf direct")
-local report_subchain = logs.reporter("fonts","otf subchain")
-local report_chain = logs.reporter("fonts","otf chain")
-local report_process = logs.reporter("fonts","otf process")
-local report_prepare = logs.reporter("fonts","otf prepare")
-
-registertracker("otf.verbose_chain", function(v) otf.setcontextchain(v and "verbose") end)
-registertracker("otf.normal_chain", function(v) otf.setcontextchain(v and "normal") end)
-
-registertracker("otf.replacements", "otf.singles,otf.multiples,otf.alternatives,otf.ligatures")
-registertracker("otf.positions","otf.marks,otf.kerns,otf.cursive")
-registertracker("otf.actions","otf.replacements,otf.positions")
-registertracker("otf.injections","nodes.injections")
-
-registertracker("*otf.sample","otf.steps,otf.actions,otf.analyzing")
-
-local insert_node_after = node.insert_after
-local delete_node = nodes.delete
-local copy_node = node.copy
-local find_node_tail = node.tail or node.slide
-local set_attribute = node.set_attribute
-local has_attribute = node.has_attribute
-local flush_node_list = node.flush_list
-
-local setmetatableindex = table.setmetatableindex
-
-local zwnj = 0x200C
-local zwj = 0x200D
-local wildcard = "*"
-local default = "dflt"
-
-local nodecodes = nodes.nodecodes
-local whatcodes = nodes.whatcodes
-local glyphcodes = nodes.glyphcodes
-
-local glyph_code = nodecodes.glyph
-local glue_code = nodecodes.glue
-local disc_code = nodecodes.disc
-local whatsit_code = nodecodes.whatsit
-
-local dir_code = whatcodes.dir
-local localpar_code = whatcodes.localpar
-
-local ligature_code = glyphcodes.ligature
-
-local privateattribute = attributes.private
-
--- Something is messed up: we have two mark / ligature indices, one at the injection
--- end and one here ... this is bases in KE's patches but there is something fishy
--- there as I'm pretty sure that for husayni we need some connection (as it's much
--- more complex than an average font) but I need proper examples of all cases, not
--- of only some.
-
-local state = privateattribute('state')
-local markbase = privateattribute('markbase')
-local markmark = privateattribute('markmark')
-local markdone = privateattribute('markdone') -- assigned at the injection end
-local cursbase = privateattribute('cursbase')
-local curscurs = privateattribute('curscurs')
-local cursdone = privateattribute('cursdone')
-local kernpair = privateattribute('kernpair')
-local ligacomp = privateattribute('ligacomp') -- assigned here (ideally it should be combined)
-
-local injections = nodes.injections
-local setmark = injections.setmark
-local setcursive = injections.setcursive
-local setkern = injections.setkern
-local setpair = injections.setpair
-
-local markonce = true
-local cursonce = true
-local kernonce = true
-
-local fonthashes = fonts.hashes
-local fontdata = fonthashes.identifiers
-
-local otffeatures = fonts.constructors.newfeatures("otf")
-local registerotffeature = otffeatures.register
-
-local onetimemessage = fonts.loggers.onetimemessage
-
-otf.defaultnodealternate = "none" -- first last
-
--- we share some vars here, after all, we have no nested lookups and
--- less code
-
-local tfmdata = false
-local characters = false
-local descriptions = false
-local resources = false
-local marks = false
-local currentfont = false
-local lookuptable = false
-local anchorlookups = false
-local lookuptypes = false
-local handlers = { }
-local rlmode = 0
-local featurevalue = false
-
--- we cannot optimize with "start = first_glyph(head)" because then we don't
--- know which rlmode we're in which messes up cursive handling later on
---
--- head is always a whatsit so we can safely assume that head is not changed
-
--- we use this for special testing and documentation
-
-local checkstep = (nodes and nodes.tracers and nodes.tracers.steppers.check) or function() end
-local registerstep = (nodes and nodes.tracers and nodes.tracers.steppers.register) or function() end
-local registermessage = (nodes and nodes.tracers and nodes.tracers.steppers.message) or function() end
-
-local function logprocess(...)
- if trace_steps then
- registermessage(...)
- end
- report_direct(...)
-end
-
-local function logwarning(...)
- report_direct(...)
-end
-
-local function gref(n)
- if type(n) == "number" then
- local description = descriptions[n]
- local name = description and description.name
- if name then
- return format("U+%05X (%s)",n,name)
- else
- return format("U+%05X",n)
- end
- elseif not n then
- return "<error in tracing>"
- else
- local num, nam = { }, { }
- for i=1,#n do
- local ni = n[i]
- if tonumber(ni) then -- later we will start at 2
- local di = descriptions[ni]
- num[i] = format("U+%05X",ni)
- nam[i] = di and di.name or "?"
- end
- end
- return format("%s (%s)",concat(num," "), concat(nam," "))
- end
-end
-
-local function cref(kind,chainname,chainlookupname,lookupname,index)
- if index then
- return format("feature %s, chain %s, sub %s, lookup %s, index %s",kind,chainname,chainlookupname,lookupname,index)
- elseif lookupname then
- return format("feature %s, chain %s, sub %s, lookup %s",kind,chainname or "?",chainlookupname or "?",lookupname)
- elseif chainlookupname then
- return format("feature %s, chain %s, sub %s",kind,chainname or "?",chainlookupname)
- elseif chainname then
- return format("feature %s, chain %s",kind,chainname)
- else
- return format("feature %s",kind)
- end
-end
-
-local function pref(kind,lookupname)
- return format("feature %s, lookup %s",kind,lookupname)
-end
-
--- we can assume that languages that use marks are not hyphenated
--- we can also assume that at most one discretionary is present
-
-local function markstoligature(kind,lookupname,start,stop,char)
- local n = copy_node(start)
- local keep = start
- local current
- current, start = insert_node_after(start,start,n)
- local snext = stop.next
- current.next = snext
- if snext then
- snext.prev = current
- end
- start.prev, stop.next = nil, nil
- current.char, current.subtype, current.components = char, ligature_code, start
- return keep
-end
-
-local function toligature(kind,lookupname,start,stop,char,markflag,discfound) -- brr head
- if start == stop then
- start.char = char
- return start
- elseif discfound then
- -- print("start->stop",nodes.tosequence(start,stop))
- local components = start.components
- if components then
- flush_node_list(components)
- start.components = nil
- end
- local lignode = copy_node(start)
- lignode.font = start.font
- lignode.char = char
- lignode.subtype = ligature_code
- local next = stop.next
- local prev = start.prev
- stop.next = nil
- start.prev = nil
- lignode.components = start
- -- print("lignode",nodes.tosequence(lignode))
- -- print("components",nodes.tosequence(lignode.components))
- prev.next = lignode
- if next then
- next.prev = lignode
- end
- lignode.next = next
- lignode.prev = prev
- -- print("start->end",nodes.tosequence(start))
- return lignode
- else
- -- start is the ligature
- local deletemarks = markflag ~= "mark"
- local n = copy_node(start)
- local current
- current, start = insert_node_after(start,start,n)
- local snext = stop.next
- current.next = snext
- if snext then
- snext.prev = current
- end
- start.prev = nil
- stop.next = nil
- current.char = char
- current.subtype = ligature_code
- current.components = start
- local head = current
- -- this is messy ... we should get rid of the components eventually
- local i = 0 -- is index of base
- while start do
- if not marks[start.char] then
- i = i + 1
- elseif not deletemarks then -- quite fishy
- set_attribute(start,ligacomp,i)
- if trace_marks then
- logwarning("%s: keep mark %s, gets index %s",pref(kind,lookupname),gref(start.char),i)
- end
- head, current = insert_node_after(head,current,copy_node(start))
- end
- start = start.next
- end
- start = current.next
- while start and start.id == glyph_code do
- if marks[start.char] then
- set_attribute(start,ligacomp,i)
- if trace_marks then
- logwarning("%s: keep mark %s, gets index %s",pref(kind,lookupname),gref(start.char),i)
- end
- else
- break
- end
- start = start.next
- end
- --
- -- we do need components in funny kerning mode but maybe I can better reconstruct then
- -- as we do have the font components info available; removing components makes the
- -- previous code much simpler
- --
- -- flush_node_list(head.components)
- return head
- end
-end
-
-function handlers.gsub_single(start,kind,lookupname,replacement)
- if trace_singles then
- logprocess("%s: replacing %s by single %s",pref(kind,lookupname),gref(start.char),gref(replacement))
- end
- start.char = replacement
- return start, true
-end
-
-local function get_alternative_glyph(start,alternatives,value)
- -- needs checking: (global value, brrr)
- local choice = nil
- local n = #alternatives
- local char = start.char
- --
- if value == "random" then
- local r = random(1,n)
- value, choice = format("random, choice %s",r), alternatives[r]
- elseif value == "first" then
- value, choice = format("first, choice %s",1), alternatives[1]
- elseif value == "last" then
- value, choice = format("last, choice %s",n), alternatives[n]
- else
- value = tonumber(value)
- if type(value) ~= "number" then
- value, choice = "default, choice 1", alternatives[1]
- elseif value > n then
- local defaultalt = otf.defaultnodealternate
- if defaultalt == "first" then
- value, choice = format("no %s variants, taking %s",value,n), alternatives[n]
- elseif defaultalt == "last" then
- value, choice = format("no %s variants, taking %s",value,1), alternatives[1]
- else
- value, choice = format("no %s variants, ignoring",value), false
- end
- elseif value == 0 then
- value, choice = format("choice %s (no change)",value), char
- elseif value < 1 then
- value, choice = format("no %s variants, taking %s",value,1), alternatives[1]
- else
- value, choice = format("choice %s",value), alternatives[value]
- end
- end
- return choice
-end
-
-local function multiple_glyphs(start,multiple) -- marks ?
- local nofmultiples = #multiple
- if nofmultiples > 0 then
- start.char = multiple[1]
- if nofmultiples > 1 then
- local sn = start.next
- for k=2,nofmultiples do -- todo: use insert_node
- local n = copy_node(start)
- n.char = multiple[k]
- n.next = sn
- n.prev = start
- if sn then
- sn.prev = n
- end
- start.next = n
- start = n
- end
- end
- return start, true
- else
- if trace_multiples then
- logprocess("no multiple for %s",gref(start.char))
- end
- return start, false
- end
-end
-
-function handlers.gsub_alternate(start,kind,lookupname,alternative,sequence)
- local value = featurevalue == true and tfmdata.shared.features[kind] or featurevalue
- local choice = get_alternative_glyph(start,alternative,value)
- if choice then
- if trace_alternatives then
- logprocess("%s: replacing %s by alternative %s (%s)",pref(kind,lookupname),gref(char),gref(choice),choice)
- end
- start.char = choice
- else
- if trace_alternatives then
- logwarning("%s: no variant %s for %s",pref(kind,lookupname),tostring(value),gref(char))
- end
- end
- return start, true
-end
-
-function handlers.gsub_multiple(start,kind,lookupname,multiple)
- if trace_multiples then
- logprocess("%s: replacing %s by multiple %s",pref(kind,lookupname),gref(start.char),gref(multiple))
- end
- return multiple_glyphs(start,multiple)
-end
-
-function handlers.gsub_ligature(start,kind,lookupname,ligature,sequence)
- local s, stop, discfound = start.next, nil, false
- local startchar = start.char
- if marks[startchar] then
- while s do
- local id = s.id
- if id == glyph_code and s.subtype<256 and s.font == currentfont then
- local lg = ligature[s.char]
- if lg then
- stop = s
- ligature = lg
- s = s.next
- else
- break
- end
- else
- break
- end
- end
- if stop then
- local lig = ligature.ligature
- if lig then
- if trace_ligatures then
- local stopchar = stop.char
- start = markstoligature(kind,lookupname,start,stop,lig)
- logprocess("%s: replacing %s upto %s by ligature %s",pref(kind,lookupname),gref(startchar),gref(stopchar),gref(start.char))
- else
- start = markstoligature(kind,lookupname,start,stop,lig)
- end
- return start, true
- else
- -- ok, goto next lookup
- end
- end
- else
- local skipmark = sequence.flags[1]
- while s do
- local id = s.id
- if id == glyph_code and s.subtype<256 then
- if s.font == currentfont then
- local char = s.char
- if skipmark and marks[char] then
- s = s.next
- else
- local lg = ligature[char]
- if lg then
- stop = s
- ligature = lg
- s = s.next
- else
- break
- end
- end
- else
- break
- end
- elseif id == disc_code then
- discfound = true
- s = s.next
- else
- break
- end
- end
- if stop then
- local lig = ligature.ligature
- if lig then
- if trace_ligatures then
- local stopchar = stop.char
- start = toligature(kind,lookupname,start,stop,lig,skipmark,discfound)
- logprocess("%s: replacing %s upto %s by ligature %s",pref(kind,lookupname),gref(startchar),gref(stopchar),gref(start.char))
- else
- start = toligature(kind,lookupname,start,stop,lig,skipmark,discfound)
- end
- return start, true
- else
- -- ok, goto next lookup
- end
- end
- end
- return start, false
-end
-
---[[ldx--
-<p>We get hits on a mark, but we're not sure if the it has to be applied so
-we need to explicitly test for basechar, baselig and basemark entries.</p>
---ldx]]--
-
-function handlers.gpos_mark2base(start,kind,lookupname,markanchors,sequence)
- local markchar = start.char
- if marks[markchar] then
- local base = start.prev -- [glyph] [start=mark]
- if base and base.id == glyph_code and base.subtype<256 and base.font == currentfont then
- local basechar = base.char
- if marks[basechar] then
- while true do
- base = base.prev
- if base and base.id == glyph_code and base.subtype<256 and base.font == currentfont then
- basechar = base.char
- if not marks[basechar] then
- break
- end
- else
- if trace_bugs then
- logwarning("%s: no base for mark %s",pref(kind,lookupname),gref(markchar))
- end
- return start, false
- end
- end
- end
- local baseanchors = descriptions[basechar]
- if baseanchors then
- baseanchors = baseanchors.anchors
- end
- if baseanchors then
- local baseanchors = baseanchors['basechar']
- if baseanchors then
- local al = anchorlookups[lookupname]
- for anchor,ba in next, baseanchors do
- if al[anchor] then
- local ma = markanchors[anchor]
- if ma then
- local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma)
- if trace_marks then
- logprocess("%s, anchor %s, bound %s: anchoring mark %s to basechar %s => (%s,%s)",
- pref(kind,lookupname),anchor,bound,gref(markchar),gref(basechar),dx,dy)
- end
- return start, true
- end
- end
- end
- if trace_bugs then
- logwarning("%s, no matching anchors for mark %s and base %s",pref(kind,lookupname),gref(markchar),gref(basechar))
- end
- end
- else -- if trace_bugs then
- -- logwarning("%s: char %s is missing in font",pref(kind,lookupname),gref(basechar))
- onetimemessage(currentfont,basechar,"no base anchors",report_fonts)
- end
- elseif trace_bugs then
- logwarning("%s: prev node is no char",pref(kind,lookupname))
- end
- elseif trace_bugs then
- logwarning("%s: mark %s is no mark",pref(kind,lookupname),gref(markchar))
- end
- return start, false
-end
-
-function handlers.gpos_mark2ligature(start,kind,lookupname,markanchors,sequence)
- -- check chainpos variant
- local markchar = start.char
- if marks[markchar] then
- local base = start.prev -- [glyph] [optional marks] [start=mark]
- if base and base.id == glyph_code and base.subtype<256 and base.font == currentfont then
- local basechar = base.char
- if marks[basechar] then
- while true do
- base = base.prev
- if base and base.id == glyph_code and base.subtype<256 and base.font == currentfont then
- basechar = base.char
- if not marks[basechar] then
- break
- end
- else
- if trace_bugs then
- logwarning("%s: no base for mark %s",pref(kind,lookupname),gref(markchar))
- end
- return start, false
- end
- end
- end
- local index = has_attribute(start,ligacomp)
- local baseanchors = descriptions[basechar]
- if baseanchors then
- baseanchors = baseanchors.anchors
- if baseanchors then
- local baseanchors = baseanchors['baselig']
- if baseanchors then
- local al = anchorlookups[lookupname]
- for anchor,ba in next, baseanchors do
- if al[anchor] then
- local ma = markanchors[anchor]
- if ma then
- ba = ba[index]
- if ba then
- local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma) -- index
- if trace_marks then
- logprocess("%s, anchor %s, index %s, bound %s: anchoring mark %s to baselig %s at index %s => (%s,%s)",
- pref(kind,lookupname),anchor,index,bound,gref(markchar),gref(basechar),index,dx,dy)
- end
- return start, true
- end
- end
- end
- end
- if trace_bugs then
- logwarning("%s: no matching anchors for mark %s and baselig %s",pref(kind,lookupname),gref(markchar),gref(basechar))
- end
- end
- end
- else -- if trace_bugs then
- -- logwarning("%s: char %s is missing in font",pref(kind,lookupname),gref(basechar))
- onetimemessage(currentfont,basechar,"no base anchors",report_fonts)
- end
- elseif trace_bugs then
- logwarning("%s: prev node is no char",pref(kind,lookupname))
- end
- elseif trace_bugs then
- logwarning("%s: mark %s is no mark",pref(kind,lookupname),gref(markchar))
- end
- return start, false
-end
-
-function handlers.gpos_mark2mark(start,kind,lookupname,markanchors,sequence)
- local markchar = start.char
- if marks[markchar] then
- local base = start.prev -- [glyph] [basemark] [start=mark]
- -- while base and has_attribute(base,ligacomp) and has_attribute(base,ligacomp) ~= has_attribute(start,ligacomp) do
- -- base = base.prev -- KE: prevents mkmk for marks on different components of a ligature
- -- end
- local slc = has_attribute(start,ligacomp)
- if slc then -- a rather messy loop ... needs checking with husayni
- while base do
- local blc = has_attribute(base,ligacomp)
- if blc and blc ~= slc then
- base = base.prev
- else
- break
- end
- end
- end
- if base and base.id == glyph_code and base.subtype<256 and base.font == currentfont then -- subtype test can go
- local basechar = base.char
- local baseanchors = descriptions[basechar]
- if baseanchors then
- baseanchors = baseanchors.anchors
- if baseanchors then
- baseanchors = baseanchors['basemark']
- if baseanchors then
- local al = anchorlookups[lookupname]
- for anchor,ba in next, baseanchors do
- if al[anchor] then
- local ma = markanchors[anchor]
- if ma then
- local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma)
- if trace_marks then
- logprocess("%s, anchor %s, bound %s: anchoring mark %s to basemark %s => (%s,%s)",
- pref(kind,lookupname),anchor,bound,gref(markchar),gref(basechar),dx,dy)
- end
- return start,true
- end
- end
- end
- if trace_bugs then
- logwarning("%s: no matching anchors for mark %s and basemark %s",pref(kind,lookupname),gref(markchar),gref(basechar))
- end
- end
- end
- else -- if trace_bugs then
- -- logwarning("%s: char %s is missing in font",pref(kind,lookupname),gref(basechar))
- onetimemessage(currentfont,basechar,"no base anchors",report_fonts)
- end
- elseif trace_bugs then
- logwarning("%s: prev node is no mark",pref(kind,lookupname))
- end
- elseif trace_bugs then
- logwarning("%s: mark %s is no mark",pref(kind,lookupname),gref(markchar))
- end
- return start,false
-end
-
-function handlers.gpos_cursive(start,kind,lookupname,exitanchors,sequence) -- to be checked
- local alreadydone = cursonce and has_attribute(start,cursbase)
- if not alreadydone then
- local done = false
- local startchar = start.char
- if marks[startchar] then
- if trace_cursive then
- logprocess("%s: ignoring cursive for mark %s",pref(kind,lookupname),gref(startchar))
- end
- else
- local nxt = start.next
- while not done and nxt and nxt.id == glyph_code and nxt.subtype<256 and nxt.font == currentfont do
- local nextchar = nxt.char
- if marks[nextchar] then
- -- should not happen (maybe warning)
- nxt = nxt.next
- else
- local entryanchors = descriptions[nextchar]
- if entryanchors then
- entryanchors = entryanchors.anchors
- if entryanchors then
- entryanchors = entryanchors['centry']
- if entryanchors then
- local al = anchorlookups[lookupname]
- for anchor, entry in next, entryanchors do
- if al[anchor] then
- local exit = exitanchors[anchor]
- if exit then
- local dx, dy, bound = setcursive(start,nxt,tfmdata.parameters.factor,rlmode,exit,entry,characters[startchar],characters[nextchar])
- if trace_cursive then
- logprocess("%s: moving %s to %s cursive (%s,%s) using anchor %s and bound %s in rlmode %s",pref(kind,lookupname),gref(startchar),gref(nextchar),dx,dy,anchor,bound,rlmode)
- end
- done = true
- break
- end
- end
- end
- end
- end
- else -- if trace_bugs then
- -- logwarning("%s: char %s is missing in font",pref(kind,lookupname),gref(startchar))
- onetimemessage(currentfont,startchar,"no entry anchors",report_fonts)
- end
- break
- end
- end
- end
- return start, done
- else
- if trace_cursive and trace_details then
- logprocess("%s, cursive %s is already done",pref(kind,lookupname),gref(start.char),alreadydone)
- end
- return start, false
- end
-end
-
-function handlers.gpos_single(start,kind,lookupname,kerns,sequence)
- local startchar = start.char
- local dx, dy, w, h = setpair(start,tfmdata.parameters.factor,rlmode,sequence.flags[4],kerns,characters[startchar])
- if trace_kerns then
- logprocess("%s: shifting single %s by (%s,%s) and correction (%s,%s)",pref(kind,lookupname),gref(startchar),dx,dy,w,h)
- end
- return start, false
-end
-
-function handlers.gpos_pair(start,kind,lookupname,kerns,sequence)
- -- todo: kerns in disc nodes: pre, post, replace -> loop over disc too
- -- todo: kerns in components of ligatures
- local snext = start.next
- if not snext then
- return start, false
- else
- local prev, done = start, false
- local factor = tfmdata.parameters.factor
- local lookuptype = lookuptypes[lookupname]
- while snext and snext.id == glyph_code and snext.subtype<256 and snext.font == currentfont do
- local nextchar = snext.char
- local krn = kerns[nextchar]
- if not krn and marks[nextchar] then
- prev = snext
- snext = snext.next
- else
- local krn = kerns[nextchar]
- if not krn then
- -- skip
- elseif type(krn) == "table" then
- if lookuptype == "pair" then -- probably not needed
- local a, b = krn[2], krn[3]
- if a and #a > 0 then
- local startchar = start.char
- local x, y, w, h = setpair(start,factor,rlmode,sequence.flags[4],a,characters[startchar])
- if trace_kerns then
- logprocess("%s: shifting first of pair %s and %s by (%s,%s) and correction (%s,%s)",pref(kind,lookupname),gref(startchar),gref(nextchar),x,y,w,h)
- end
- end
- if b and #b > 0 then
- local startchar = start.char
- local x, y, w, h = setpair(snext,factor,rlmode,sequence.flags[4],b,characters[nextchar])
- if trace_kerns then
- logprocess("%s: shifting second of pair %s and %s by (%s,%s) and correction (%s,%s)",pref(kind,lookupname),gref(startchar),gref(nextchar),x,y,w,h)
- end
- end
- else -- wrong ... position has different entries
- report_process("%s: check this out (old kern stuff)",pref(kind,lookupname))
- -- local a, b = krn[2], krn[6]
- -- if a and a ~= 0 then
- -- local k = setkern(snext,factor,rlmode,a)
- -- if trace_kerns then
- -- logprocess("%s: inserting first kern %s between %s and %s",pref(kind,lookupname),k,gref(prev.char),gref(nextchar))
- -- end
- -- end
- -- if b and b ~= 0 then
- -- logwarning("%s: ignoring second kern xoff %s",pref(kind,lookupname),b*factor)
- -- end
- end
- done = true
- elseif krn ~= 0 then
- local k = setkern(snext,factor,rlmode,krn)
- if trace_kerns then
- logprocess("%s: inserting kern %s between %s and %s",pref(kind,lookupname),k,gref(prev.char),gref(nextchar))
- end
- done = true
- end
- break
- end
- end
- return start, done
- end
-end
-
---[[ldx--
-<p>I will implement multiple chain replacements once I run into a font that uses
-it. It's not that complex to handle.</p>
---ldx]]--
-
-local chainmores = { }
-local chainprocs = { }
-
-local function logprocess(...)
- if trace_steps then
- registermessage(...)
- end
- report_subchain(...)
-end
-
-local logwarning = report_subchain
-
-local function logprocess(...)
- if trace_steps then
- registermessage(...)
- end
- report_chain(...)
-end
-
-local logwarning = report_chain
-
--- We could share functions but that would lead to extra function calls with many
--- arguments, redundant tests and confusing messages.
-
-function chainprocs.chainsub(start,stop,kind,chainname,currentcontext,lookuphash,lookuplist,chainlookupname)
- logwarning("%s: a direct call to chainsub cannot happen",cref(kind,chainname,chainlookupname))
- return start, false
-end
-
-function chainmores.chainsub(start,stop,kind,chainname,currentcontext,lookuphash,lookuplist,chainlookupname,n)
- logprocess("%s: a direct call to chainsub cannot happen",cref(kind,chainname,chainlookupname))
- return start, false
-end
-
--- The reversesub is a special case, which is why we need to store the replacements
--- in a bit weird way. There is no lookup and the replacement comes from the lookup
--- itself. It is meant mostly for dealing with Urdu.
-
-function chainprocs.reversesub(start,stop,kind,chainname,currentcontext,lookuphash,replacements)
- local char = start.char
- local replacement = replacements[char]
- if replacement then
- if trace_singles then
- logprocess("%s: single reverse replacement of %s by %s",cref(kind,chainname),gref(char),gref(replacement))
- end
- start.char = replacement
- return start, true
- else
- return start, false
- end
-end
-
---[[ldx--
-<p>This chain stuff is somewhat tricky since we can have a sequence of actions to be
-applied: single, alternate, multiple or ligature where ligature can be an invalid
-one in the sense that it will replace multiple by one but not neccessary one that
-looks like the combination (i.e. it is the counterpart of multiple then). For
-example, the following is valid:</p>
-
-<typing>
-<line>xxxabcdexxx [single a->A][multiple b->BCD][ligature cde->E] xxxABCDExxx</line>
-</typing>
-
-<p>Therefore we we don't really do the replacement here already unless we have the
-single lookup case. The efficiency of the replacements can be improved by deleting
-as less as needed but that would also make the code even more messy.</p>
---ldx]]--
-
-local function delete_till_stop(start,stop,ignoremarks) -- keeps start
- local n = 1
- if start == stop then
- -- done
- elseif ignoremarks then
- repeat -- start x x m x x stop => start m
- local next = start.next
- if not marks[next.char] then
- delete_node(start,next)
- end
- n = n + 1
- until next == stop
- else -- start x x x stop => start
- repeat
- local next = start.next
- delete_node(start,next)
- n = n + 1
- until next == stop
- end
- return n
-end
-
---[[ldx--
-<p>Here we replace start by a single variant, First we delete the rest of the
-match.</p>
---ldx]]--
-
-function chainprocs.gsub_single(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,chainindex)
- -- todo: marks ?
- local current = start
- local subtables = currentlookup.subtables
- if #subtables > 1 then
- logwarning("todo: check if we need to loop over the replacements: %s",concat(subtables," "))
- end
- while current do
- if current.id == glyph_code then
- local currentchar = current.char
- local lookupname = subtables[1] -- only 1
- local replacement = lookuphash[lookupname]
- if not replacement then
- if trace_bugs then
- logwarning("%s: no single hits",cref(kind,chainname,chainlookupname,lookupname,chainindex))
- end
- else
- replacement = replacement[currentchar]
- if not replacement then
- if trace_bugs then
- logwarning("%s: no single for %s",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(currentchar))
- end
- else
- if trace_singles then
- logprocess("%s: replacing single %s by %s",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(currentchar),gref(replacement))
- end
- current.char = replacement
- end
- end
- return start, true
- elseif current == stop then
- break
- else
- current = current.next
- end
- end
- return start, false
-end
-
-chainmores.gsub_single = chainprocs.gsub_single
-
---[[ldx--
-<p>Here we replace start by a sequence of new glyphs. First we delete the rest of
-the match.</p>
---ldx]]--
-
-function chainprocs.gsub_multiple(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
- delete_till_stop(start,stop) -- we could pass ignoremarks as #3 ..
- local startchar = start.char
- local subtables = currentlookup.subtables
- local lookupname = subtables[1]
- local replacements = lookuphash[lookupname]
- if not replacements then
- if trace_bugs then
- logwarning("%s: no multiple hits",cref(kind,chainname,chainlookupname,lookupname))
- end
- else
- replacements = replacements[startchar]
- if not replacements then
- if trace_bugs then
- logwarning("%s: no multiple for %s",cref(kind,chainname,chainlookupname,lookupname),gref(startchar))
- end
- else
- if trace_multiples then
- logprocess("%s: replacing %s by multiple characters %s",cref(kind,chainname,chainlookupname,lookupname),gref(startchar),gref(replacements))
- end
- return multiple_glyphs(start,replacements)
- end
- end
- return start, false
-end
-
--- function chainmores.gsub_multiple(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,n)
--- logprocess("%s: gsub_multiple not yet supported",cref(kind,chainname,chainlookupname))
--- return start, false
--- end
-
-chainmores.gsub_multiple = chainprocs.gsub_multiple
-
---[[ldx--
-<p>Here we replace start by new glyph. First we delete the rest of the match.</p>
---ldx]]--
-
--- char_1 mark_1 -> char_x mark_1 (ignore marks)
--- char_1 mark_1 -> char_x
-
--- to be checked: do we always have just one glyph?
--- we can also have alternates for marks
--- marks come last anyway
--- are there cases where we need to delete the mark
-
-function chainprocs.gsub_alternate(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
- local current = start
- local subtables = currentlookup.subtables
- local value = featurevalue == true and tfmdata.shared.features[kind] or featurevalue
- while current do
- if current.id == glyph_code then -- is this check needed?
- local currentchar = current.char
- local lookupname = subtables[1]
- local alternatives = lookuphash[lookupname]
- if not alternatives then
- if trace_bugs then
- logwarning("%s: no alternative hit",cref(kind,chainname,chainlookupname,lookupname))
- end
- else
- alternatives = alternatives[currentchar]
- if alternatives then
- local choice = get_alternative_glyph(current,alternatives,value)
- if choice then
- if trace_alternatives then
- logprocess("%s: replacing %s by alternative %s (%s)",cref(kind,chainname,chainlookupname,lookupname),gref(char),gref(choice),choice)
- end
- start.char = choice
- else
- if trace_alternatives then
- logwarning("%s: no variant %s for %s",cref(kind,chainname,chainlookupname,lookupname),tostring(value),gref(char))
- end
- end
- elseif trace_bugs then
- logwarning("%s: no alternative for %s",cref(kind,chainname,chainlookupname,lookupname),gref(currentchar))
- end
- end
- return start, true
- elseif current == stop then
- break
- else
- current = current.next
- end
- end
- return start, false
-end
-
--- function chainmores.gsub_alternate(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,n)
--- logprocess("%s: gsub_alternate not yet supported",cref(kind,chainname,chainlookupname))
--- return start, false
--- end
-
-chainmores.gsub_alternate = chainprocs.gsub_alternate
-
---[[ldx--
-<p>When we replace ligatures we use a helper that handles the marks. I might change
-this function (move code inline and handle the marks by a separate function). We
-assume rather stupid ligatures (no complex disc nodes).</p>
---ldx]]--
-
-function chainprocs.gsub_ligature(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,chainindex)
- local startchar = start.char
- local subtables = currentlookup.subtables
- local lookupname = subtables[1]
- local ligatures = lookuphash[lookupname]
- if not ligatures then
- if trace_bugs then
- logwarning("%s: no ligature hits",cref(kind,chainname,chainlookupname,lookupname,chainindex))
- end
- else
- ligatures = ligatures[startchar]
- if not ligatures then
- if trace_bugs then
- logwarning("%s: no ligatures starting with %s",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar))
- end
- else
- local s, discfound, last, nofreplacements = start.next, false, stop, 0
- while s do
- local id = s.id
- if id == disc_code then
- s = s.next
- discfound = true
- else
- local schar = s.char
- if marks[schar] then -- marks
- s = s.next
- else
- local lg = ligatures[schar]
- if lg then
- ligatures, last, nofreplacements = lg, s, nofreplacements + 1
- if s == stop then
- break
- else
- s = s.next
- end
- else
- break
- end
- end
- end
- end
- local l2 = ligatures.ligature
- if l2 then
- if chainindex then
- stop = last
- end
- if trace_ligatures then
- if start == stop then
- logprocess("%s: replacing character %s by ligature %s",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar),gref(l2))
- else
- logprocess("%s: replacing character %s upto %s by ligature %s",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar),gref(stop.char),gref(l2))
- end
- end
- start = toligature(kind,lookupname,start,stop,l2,currentlookup.flags[1],discfound)
- return start, true, nofreplacements
- elseif trace_bugs then
- if start == stop then
- logwarning("%s: replacing character %s by ligature fails",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar))
- else
- logwarning("%s: replacing character %s upto %s by ligature fails",cref(kind,chainname,chainlookupname,lookupname,chainindex),gref(startchar),gref(stop.char))
- end
- end
- end
- end
- return start, false, 0
-end
-
-chainmores.gsub_ligature = chainprocs.gsub_ligature
-
-function chainprocs.gpos_mark2base(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
- local markchar = start.char
- if marks[markchar] then
- local subtables = currentlookup.subtables
- local lookupname = subtables[1]
- local markanchors = lookuphash[lookupname]
- if markanchors then
- markanchors = markanchors[markchar]
- end
- if markanchors then
- local base = start.prev -- [glyph] [start=mark]
- if base and base.id == glyph_code and base.subtype<256 and base.font == currentfont then
- local basechar = base.char
- if marks[basechar] then
- while true do
- base = base.prev
- if base and base.id == glyph_code and base.subtype<256 and base.font == currentfont then
- basechar = base.char
- if not marks[basechar] then
- break
- end
- else
- if trace_bugs then
- logwarning("%s: no base for mark %s",pref(kind,lookupname),gref(markchar))
- end
- return start, false
- end
- end
- end
- local baseanchors = descriptions[basechar].anchors
- if baseanchors then
- local baseanchors = baseanchors['basechar']
- if baseanchors then
- local al = anchorlookups[lookupname]
- for anchor,ba in next, baseanchors do
- if al[anchor] then
- local ma = markanchors[anchor]
- if ma then
- local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma)
- if trace_marks then
- logprocess("%s, anchor %s, bound %s: anchoring mark %s to basechar %s => (%s,%s)",
- cref(kind,chainname,chainlookupname,lookupname),anchor,bound,gref(markchar),gref(basechar),dx,dy)
- end
- return start, true
- end
- end
- end
- if trace_bugs then
- logwarning("%s, no matching anchors for mark %s and base %s",cref(kind,chainname,chainlookupname,lookupname),gref(markchar),gref(basechar))
- end
- end
- end
- elseif trace_bugs then
- logwarning("%s: prev node is no char",cref(kind,chainname,chainlookupname,lookupname))
- end
- elseif trace_bugs then
- logwarning("%s: mark %s has no anchors",cref(kind,chainname,chainlookupname,lookupname),gref(markchar))
- end
- elseif trace_bugs then
- logwarning("%s: mark %s is no mark",cref(kind,chainname,chainlookupname),gref(markchar))
- end
- return start, false
-end
-
-function chainprocs.gpos_mark2ligature(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
- local markchar = start.char
- if marks[markchar] then
- local subtables = currentlookup.subtables
- local lookupname = subtables[1]
- local markanchors = lookuphash[lookupname]
- if markanchors then
- markanchors = markanchors[markchar]
- end
- if markanchors then
- local base = start.prev -- [glyph] [optional marks] [start=mark]
- if base and base.id == glyph_code and base.subtype<256 and base.font == currentfont then
- local basechar = base.char
- if marks[basechar] then
- while true do
- base = base.prev
- if base and base.id == glyph_code and base.subtype<256 and base.font == currentfont then
- basechar = base.char
- if not marks[basechar] then
- break
- end
- else
- if trace_bugs then
- logwarning("%s: no base for mark %s",cref(kind,chainname,chainlookupname,lookupname),markchar)
- end
- return start, false
- end
- end
- end
- -- todo: like marks a ligatures hash
- local index = has_attribute(start,ligacomp)
- local baseanchors = descriptions[basechar].anchors
- if baseanchors then
- local baseanchors = baseanchors['baselig']
- if baseanchors then
- local al = anchorlookups[lookupname]
- for anchor,ba in next, baseanchors do
- if al[anchor] then
- local ma = markanchors[anchor]
- if ma then
- ba = ba[index]
- if ba then
- local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma) -- index
- if trace_marks then
- logprocess("%s, anchor %s, bound %s: anchoring mark %s to baselig %s at index %s => (%s,%s)",
- cref(kind,chainname,chainlookupname,lookupname),anchor,a or bound,gref(markchar),gref(basechar),index,dx,dy)
- end
- return start, true
- end
- end
- end
- end
- if trace_bugs then
- logwarning("%s: no matching anchors for mark %s and baselig %s",cref(kind,chainname,chainlookupname,lookupname),gref(markchar),gref(basechar))
- end
- end
- end
- elseif trace_bugs then
- logwarning("feature %s, lookup %s: prev node is no char",kind,lookupname)
- end
- elseif trace_bugs then
- logwarning("%s: mark %s has no anchors",cref(kind,chainname,chainlookupname,lookupname),gref(markchar))
- end
- elseif trace_bugs then
- logwarning("%s: mark %s is no mark",cref(kind,chainname,chainlookupname),gref(markchar))
- end
- return start, false
-end
-
-function chainprocs.gpos_mark2mark(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
- local markchar = start.char
- if marks[markchar] then
---~ local alreadydone = markonce and has_attribute(start,markmark)
---~ if not alreadydone then
- -- local markanchors = descriptions[markchar].anchors markanchors = markanchors and markanchors.mark
- local subtables = currentlookup.subtables
- local lookupname = subtables[1]
- local markanchors = lookuphash[lookupname]
- if markanchors then
- markanchors = markanchors[markchar]
- end
- if markanchors then
- local base = start.prev -- [glyph] [basemark] [start=mark]
- -- while (base and has_attribute(base,ligacomp) and has_attribute(base,ligacomp) ~= has_attribute(start,ligacomp)) do
- -- base = base.prev -- KE: prevents mkmk for marks on different components of a ligature
- -- end
- local slc = has_attribute(start,ligacomp)
- if slc then -- a rather messy loop ... needs checking with husayni
- while base do
- local blc = has_attribute(base,ligacomp)
- if blc and blc ~= slc then
- base = base.prev
- else
- break
- end
- end
- end
- if base and base.id == glyph_code and base.subtype<256 and base.font == currentfont then -- subtype test can go
- local basechar = base.char
- local baseanchors = descriptions[basechar].anchors
- if baseanchors then
- baseanchors = baseanchors['basemark']
- if baseanchors then
- local al = anchorlookups[lookupname]
- for anchor,ba in next, baseanchors do
- if al[anchor] then
- local ma = markanchors[anchor]
- if ma then
- local dx, dy, bound = setmark(start,base,tfmdata.parameters.factor,rlmode,ba,ma)
- if trace_marks then
- logprocess("%s, anchor %s, bound %s: anchoring mark %s to basemark %s => (%s,%s)",
- cref(kind,chainname,chainlookupname,lookupname),anchor,bound,gref(markchar),gref(basechar),dx,dy)
- end
- return start, true
- end
- end
- end
- if trace_bugs then
- logwarning("%s: no matching anchors for mark %s and basemark %s",gref(kind,chainname,chainlookupname,lookupname),gref(markchar),gref(basechar))
- end
- end
- end
- elseif trace_bugs then
- logwarning("%s: prev node is no mark",cref(kind,chainname,chainlookupname,lookupname))
- end
- elseif trace_bugs then
- logwarning("%s: mark %s has no anchors",cref(kind,chainname,chainlookupname,lookupname),gref(markchar))
- end
---~ elseif trace_marks and trace_details then
---~ logprocess("%s, mark %s is already bound (n=%s), ignoring mark2mark",pref(kind,lookupname),gref(markchar),alreadydone)
---~ end
- elseif trace_bugs then
- logwarning("%s: mark %s is no mark",cref(kind,chainname,chainlookupname),gref(markchar))
- end
- return start, false
-end
-
--- ! ! ! untested ! ! !
-
-function chainprocs.gpos_cursive(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname)
- local alreadydone = cursonce and has_attribute(start,cursbase)
- if not alreadydone then
- local startchar = start.char
- local subtables = currentlookup.subtables
- local lookupname = subtables[1]
- local exitanchors = lookuphash[lookupname]
- if exitanchors then
- exitanchors = exitanchors[startchar]
- end
- if exitanchors then
- local done = false
- if marks[startchar] then
- if trace_cursive then
- logprocess("%s: ignoring cursive for mark %s",pref(kind,lookupname),gref(startchar))
- end
- else
- local nxt = start.next
- while not done and nxt and nxt.id == glyph_code and nxt.subtype<256 and nxt.font == currentfont do
- local nextchar = nxt.char
- if marks[nextchar] then
- -- should not happen (maybe warning)
- nxt = nxt.next
- else
- local entryanchors = descriptions[nextchar]
- if entryanchors then
- entryanchors = entryanchors.anchors
- if entryanchors then
- entryanchors = entryanchors['centry']
- if entryanchors then
- local al = anchorlookups[lookupname]
- for anchor, entry in next, entryanchors do
- if al[anchor] then
- local exit = exitanchors[anchor]
- if exit then
- local dx, dy, bound = setcursive(start,nxt,tfmdata.parameters.factor,rlmode,exit,entry,characters[startchar],characters[nextchar])
- if trace_cursive then
- logprocess("%s: moving %s to %s cursive (%s,%s) using anchor %s and bound %s in rlmode %s",pref(kind,lookupname),gref(startchar),gref(nextchar),dx,dy,anchor,bound,rlmode)
- end
- done = true
- break
- end
- end
- end
- end
- end
- else -- if trace_bugs then
- -- logwarning("%s: char %s is missing in font",pref(kind,lookupname),gref(startchar))
- onetimemessage(currentfont,startchar,"no entry anchors",report_fonts)
- end
- break
- end
- end
- end
- return start, done
- else
- if trace_cursive and trace_details then
- logprocess("%s, cursive %s is already done",pref(kind,lookupname),gref(start.char),alreadydone)
- end
- return start, false
- end
- end
- return start, false
-end
-
-function chainprocs.gpos_single(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,chainindex,sequence)
- -- untested .. needs checking for the new model
- local startchar = start.char
- local subtables = currentlookup.subtables
- local lookupname = subtables[1]
- local kerns = lookuphash[lookupname]
- if kerns then
- kerns = kerns[startchar] -- needed ?
- if kerns then
- local dx, dy, w, h = setpair(start,tfmdata.parameters.factor,rlmode,sequence.flags[4],kerns,characters[startchar])
- if trace_kerns then
- logprocess("%s: shifting single %s by (%s,%s) and correction (%s,%s)",cref(kind,chainname,chainlookupname),gref(startchar),dx,dy,w,h)
- end
- end
- end
- return start, false
-end
-
--- when machines become faster i will make a shared function
-
-function chainprocs.gpos_pair(start,stop,kind,chainname,currentcontext,lookuphash,currentlookup,chainlookupname,chainindex,sequence)
--- logwarning("%s: gpos_pair not yet supported",cref(kind,chainname,chainlookupname))
- local snext = start.next
- if snext then
- local startchar = start.char
- local subtables = currentlookup.subtables
- local lookupname = subtables[1]
- local kerns = lookuphash[lookupname]
- if kerns then
- kerns = kerns[startchar]
- if kerns then
- local lookuptype = lookuptypes[lookupname]
- local prev, done = start, false
- local factor = tfmdata.parameters.factor
- while snext and snext.id == glyph_code and snext.subtype<256 and snext.font == currentfont do
- local nextchar = snext.char
- local krn = kerns[nextchar]
- if not krn and marks[nextchar] then
- prev = snext
- snext = snext.next
- else
- if not krn then
- -- skip
- elseif type(krn) == "table" then
- if lookuptype == "pair" then
- local a, b = krn[2], krn[3]
- if a and #a > 0 then
- local startchar = start.char
- local x, y, w, h = setpair(start,factor,rlmode,sequence.flags[4],a,characters[startchar])
- if trace_kerns then
- logprocess("%s: shifting first of pair %s and %s by (%s,%s) and correction (%s,%s)",cref(kind,chainname,chainlookupname),gref(startchar),gref(nextchar),x,y,w,h)
- end
- end
- if b and #b > 0 then
- local startchar = start.char
- local x, y, w, h = setpair(snext,factor,rlmode,sequence.flags[4],b,characters[nextchar])
- if trace_kerns then
- logprocess("%s: shifting second of pair %s and %s by (%s,%s) and correction (%s,%s)",cref(kind,chainname,chainlookupname),gref(startchar),gref(nextchar),x,y,w,h)
- end
- end
- else
- report_process("%s: check this out (old kern stuff)",cref(kind,chainname,chainlookupname))
- local a, b = krn[2], krn[6]
- if a and a ~= 0 then
- local k = setkern(snext,factor,rlmode,a)
- if trace_kerns then
- logprocess("%s: inserting first kern %s between %s and %s",cref(kind,chainname,chainlookupname),k,gref(prev.char),gref(nextchar))
- end
- end
- if b and b ~= 0 then
- logwarning("%s: ignoring second kern xoff %s",cref(kind,chainname,chainlookupname),b*factor)
- end
- end
- done = true
- elseif krn ~= 0 then
- local k = setkern(snext,factor,rlmode,krn)
- if trace_kerns then
- logprocess("%s: inserting kern %s between %s and %s",cref(kind,chainname,chainlookupname),k,gref(prev.char),gref(nextchar))
- end
- done = true
- end
- break
- end
- end
- return start, done
- end
- end
- end
- return start, false
-end
-
--- what pointer to return, spec says stop
--- to be discussed ... is bidi changer a space?
--- elseif char == zwnj and sequence[n][32] then -- brrr
-
--- somehow l or f is global
--- we don't need to pass the currentcontext, saves a bit
--- make a slow variant then can be activated but with more tracing
-
-local function show_skip(kind,chainname,char,ck,class)
- if ck[9] then
- logwarning("%s: skipping char %s (%s) in rule %s, lookuptype %s (%s=>%s)",cref(kind,chainname),gref(char),class,ck[1],ck[2],ck[9],ck[10])
- else
- logwarning("%s: skipping char %s (%s) in rule %s, lookuptype %s",cref(kind,chainname),gref(char),class,ck[1],ck[2])
- end
-end
-
-local function normal_handle_contextchain(start,kind,chainname,contexts,sequence,lookuphash)
- -- local rule, lookuptype, sequence, f, l, lookups = ck[1], ck[2] ,ck[3], ck[4], ck[5], ck[6]
- local flags = sequence.flags
- local done = false
- local skipmark = flags[1]
- local skipligature = flags[2]
- local skipbase = flags[3]
- local someskip = skipmark or skipligature or skipbase -- could be stored in flags for a fast test (hm, flags could be false !)
- local markclass = sequence.markclass -- todo, first we need a proper test
- local skipped = false
- for k=1,#contexts do
- local match = true
- local current = start
- local last = start
- local ck = contexts[k]
- local seq = ck[3]
- local s = #seq
- -- f..l = mid string
- if s == 1 then
- -- never happens
- match = current.id == glyph_code and current.subtype<256 and current.font == currentfont and seq[1][current.char]
- else
- -- maybe we need a better space check (maybe check for glue or category or combination)
- -- we cannot optimize for n=2 because there can be disc nodes
- local f, l = ck[4], ck[5]
- -- current match
- if f == 1 and f == l then -- current only
- -- already a hit
- -- match = true
- else -- before/current/after | before/current | current/after
- -- no need to test first hit (to be optimized)
- if f == l then -- new, else last out of sync (f is > 1)
- -- match = true
- else
- local n = f + 1
- last = last.next
- while n <= l do
- if last then
- local id = last.id
- if id == glyph_code then
- if last.subtype<256 and last.font == currentfont then
- local char = last.char
- local ccd = descriptions[char]
- if ccd then
- local class = ccd.class
- if class == skipmark or class == skipligature or class == skipbase or (markclass and class == "mark" and not markclass[char]) then
- skipped = true
- if trace_skips then
- show_skip(kind,chainname,char,ck,class)
- end
- last = last.next
- elseif seq[n][char] then
- if n < l then
- last = last.next
- end
- n = n + 1
- else
- match = false
- break
- end
- else
- match = false
- break
- end
- else
- match = false
- break
- end
- elseif id == disc_code then
- last = last.next
- else
- match = false
- break
- end
- else
- match = false
- break
- end
- end
- end
- end
- -- before
- if match and f > 1 then
- local prev = start.prev
- if prev then
- local n = f-1
- while n >= 1 do
- if prev then
- local id = prev.id
- if id == glyph_code then
- if prev.subtype<256 and prev.font == currentfont then -- normal char
- local char = prev.char
- local ccd = descriptions[char]
- if ccd then
- local class = ccd.class
- if class == skipmark or class == skipligature or class == skipbase or (markclass and class == "mark" and not markclass[char]) then
- skipped = true
- if trace_skips then
- show_skip(kind,chainname,char,ck,class)
- end
- elseif seq[n][char] then
- n = n -1
- else
- match = false
- break
- end
- else
- match = false
- break
- end
- else
- match = false
- break
- end
- elseif id == disc_code then
- -- skip 'm
- elseif seq[n][32] then
- n = n -1
- else
- match = false
- break
- end
- prev = prev.prev
- elseif seq[n][32] then -- somehat special, as zapfino can have many preceding spaces
- n = n -1
- else
- match = false
- break
- end
- end
- elseif f == 2 then
- match = seq[1][32]
- else
- for n=f-1,1 do
- if not seq[n][32] then
- match = false
- break
- end
- end
- end
- end
- -- after
- if match and s > l then
- local current = last and last.next
- if current then
- -- removed optimization for s-l == 1, we have to deal with marks anyway
- local n = l + 1
- while n <= s do
- if current then
- local id = current.id
- if id == glyph_code then
- if current.subtype<256 and current.font == currentfont then -- normal char
- local char = current.char
- local ccd = descriptions[char]
- if ccd then
- local class = ccd.class
- if class == skipmark or class == skipligature or class == skipbase or (markclass and class == "mark" and not markclass[char]) then
- skipped = true
- if trace_skips then
- show_skip(kind,chainname,char,ck,class)
- end
- elseif seq[n][char] then
- n = n + 1
- else
- match = false
- break
- end
- else
- match = false
- break
- end
- else
- match = false
- break
- end
- elseif id == disc_code then
- -- skip 'm
- elseif seq[n][32] then -- brrr
- n = n + 1
- else
- match = false
- break
- end
- current = current.next
- elseif seq[n][32] then
- n = n + 1
- else
- match = false
- break
- end
- end
- elseif s-l == 1 then
- match = seq[s][32]
- else
- for n=l+1,s do
- if not seq[n][32] then
- match = false
- break
- end
- end
- end
- end
- end
- if match then
- -- ck == currentcontext
- if trace_contexts then
- local rule, lookuptype, f, l = ck[1], ck[2], ck[4], ck[5]
- local char = start.char
- if ck[9] then
- logwarning("%s: rule %s matches at char %s for (%s,%s,%s) chars, lookuptype %s (%s=>%s)",
- cref(kind,chainname),rule,gref(char),f-1,l-f+1,s-l,lookuptype,ck[9],ck[10])
- else
- logwarning("%s: rule %s matches at char %s for (%s,%s,%s) chars, lookuptype %s",
- cref(kind,chainname),rule,gref(char),f-1,l-f+1,s-l,lookuptype)
- end
- end
- local chainlookups = ck[6]
- if chainlookups then
- local nofchainlookups = #chainlookups
- -- we can speed this up if needed
- if nofchainlookups == 1 then
- local chainlookupname = chainlookups[1]
- local chainlookup = lookuptable[chainlookupname]
- if chainlookup then
- local cp = chainprocs[chainlookup.type]
- if cp then
- start, done = cp(start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,nil,sequence)
- else
- logprocess("%s: %s is not yet supported",cref(kind,chainname,chainlookupname),chainlookup.type)
- end
- else -- shouldn't happen
- logprocess("%s is not yet supported",cref(kind,chainname,chainlookupname))
- end
- else
- local i = 1
- repeat
- if skipped then
- while true do
- local char = start.char
- local ccd = descriptions[char]
- if ccd then
- local class = ccd.class
- if class == skipmark or class == skipligature or class == skipbase or (markclass and class == "mark" and not markclass[char]) then
- start = start.next
- else
- break
- end
- else
- break
- end
- end
- end
- local chainlookupname = chainlookups[i]
- local chainlookup = lookuptable[chainlookupname] -- can be false (n matches, <n replacement)
- local cp = chainlookup and chainmores[chainlookup.type]
- if cp then
- local ok, n
- start, ok, n = cp(start,last,kind,chainname,ck,lookuphash,chainlookup,chainlookupname,i,sequence)
- -- messy since last can be changed !
- if ok then
- done = true
- -- skip next one(s) if ligature
- i = i + (n or 1)
- else
- i = i + 1
- end
- else
- -- is valid
- -- logprocess("%s: multiple subchains for %s are not yet supported",cref(kind,chainname,chainlookupname),chainlookup and chainlookup.type or "?")
- i = i + 1
- end
- start = start.next
- until i > nofchainlookups
- end
- else
- local replacements = ck[7]
- if replacements then
- start, done = chainprocs.reversesub(start,last,kind,chainname,ck,lookuphash,replacements) -- sequence
- else
- done = true -- can be meant to be skipped
- if trace_contexts then
- logprocess("%s: skipping match",cref(kind,chainname))
- end
- end
- end
- end
- end
- return start, done
-end
-
--- Because we want to keep this elsewhere (an because speed is less an issue) we
--- pass the font id so that the verbose variant can access the relevant helper tables.
-
-local verbose_handle_contextchain = function(font,...)
- logwarning("no verbose handler installed, reverting to 'normal'")
- otf.setcontextchain()
- return normal_handle_contextchain(...)
-end
-
-otf.chainhandlers = {
- normal = normal_handle_contextchain,
- verbose = verbose_handle_contextchain,
-}
-
-function otf.setcontextchain(method)
- if not method or method == "normal" or not otf.chainhandlers[method] then
- if handlers.contextchain then -- no need for a message while making the format
- logwarning("installing normal contextchain handler")
- end
- handlers.contextchain = normal_handle_contextchain
- else
- logwarning("installing contextchain handler '%s'",method)
- local handler = otf.chainhandlers[method]
- handlers.contextchain = function(...)
- return handler(currentfont,...) -- hm, get rid of ...
- end
- end
- handlers.gsub_context = handlers.contextchain
- handlers.gsub_contextchain = handlers.contextchain
- handlers.gsub_reversecontextchain = handlers.contextchain
- handlers.gpos_contextchain = handlers.contextchain
- handlers.gpos_context = handlers.contextchain
-end
-
-otf.setcontextchain()
-
-local missing = { } -- we only report once
-
-local function logprocess(...)
- if trace_steps then
- registermessage(...)
- end
- report_process(...)
-end
-
-local logwarning = report_process
-
-local function report_missing_cache(typ,lookup)
- local f = missing[currentfont] if not f then f = { } missing[currentfont] = f end
- local t = f[typ] if not t then t = { } f[typ] = t end
- if not t[lookup] then
- t[lookup] = true
- logwarning("missing cache for lookup %s of type %s in font %s (%s)",lookup,typ,currentfont,tfmdata.properties.fullname)
- end
-end
-
-local resolved = { } -- we only resolve a font,script,language pair once
-
--- todo: pass all these 'locals' in a table
-
-local lookuphashes = { }
-
-setmetatableindex(lookuphashes, function(t,font)
- local lookuphash = fontdata[font].resources.lookuphash
- if not lookuphash or not next(lookuphash) then
- lookuphash = false
- end
- t[font] = lookuphash
- return lookuphash
-end)
-
--- fonts.hashes.lookups = lookuphashes
-
-local special_attributes = {
- init = 1,
- medi = 2,
- fina = 3,
- isol = 4
-}
-
-local function initialize(sequence,script,language,enabled)
- local features = sequence.features
- if features then
- for kind, scripts in next, features do
- local valid = enabled[kind]
- if valid then
- local languages = scripts[script] or scripts[wildcard]
- if languages and (languages[language] or languages[wildcard]) then
- return { valid, special_attributes[kind] or false, sequence.chain or 0, kind, sequence }
- end
- end
- end
- end
- return false
-end
-
-function otf.dataset(tfmdata,sequences,font) -- generic variant, overloaded in context
- local shared = tfmdata.shared
- local properties = tfmdata.properties
- local language = properties.language or "dflt"
- local script = properties.script or "dflt"
- local enabled = shared.features
- local res = resolved[font]
- if not res then
- res = { }
- resolved[font] = res
- end
- local rs = res[script]
- if not rs then
- rs = { }
- res[script] = rs
- end
- local rl = rs[language]
- if not rl then
- rl = { }
- rs[language] = rl
- setmetatableindex(rl, function(t,k)
- local v = enabled and initialize(sequences[k],script,language,enabled)
- t[k] = v
- return v
- end)
- end
- return rl
-end
-
--- elseif id == glue_code then
--- if p[5] then -- chain
--- local pc = pp[32]
--- if pc then
--- start, ok = start, false -- p[1](start,kind,p[2],pc,p[3],p[4])
--- if ok then
--- done = true
--- end
--- if start then start = start.next end
--- else
--- start = start.next
--- end
--- else
--- start = start.next
--- end
-
-local function featuresprocessor(head,font,attr)
-
- local lookuphash = lookuphashes[font] -- we can also check sequences here
-
- if not lookuphash then
- return head, false
- end
-
- if trace_steps then
- checkstep(head)
- end
-
- tfmdata = fontdata[font]
- descriptions = tfmdata.descriptions
- characters = tfmdata.characters
- resources = tfmdata.resources
-
- marks = resources.marks
- anchorlookups = resources.lookup_to_anchor
- lookuptable = resources.lookups
- lookuptypes = resources.lookuptypes
-
- currentfont = font
- rlmode = 0
-
- local sequences = resources.sequences
- local done = false
- local datasets = otf.dataset(tfmdata,sequences,font,attr)
-
- local dirstack = { } -- could move outside function
-
- -- We could work on sub start-stop ranges instead but I wonder if there is that
- -- much speed gain (experiments showed that it made not much sense) and we need
- -- to keep track of directions anyway. Also at some point I want to play with
- -- font interactions and then we do need the full sweeps.
-
- for s=1,#sequences do
- local dataset = datasets[s]
- if dataset then
- featurevalue = dataset[1] -- todo: pass to function instead of using a global
- if featurevalue then
- local sequence = sequences[s] -- also dataset[5]
- local rlparmode = 0
- local topstack = 0
- local success = false
- local attribute = dataset[2]
- local chain = dataset[3] -- sequence.chain or 0
- local typ = sequence.type
- local subtables = sequence.subtables
- if chain < 0 then
- -- this is a limited case, no special treatments like 'init' etc
- local handler = handlers[typ]
- -- we need to get rid of this slide! probably no longer needed in latest luatex
- local start = find_node_tail(head) -- slow (we can store tail because there's always a skip at the end): todo
- while start do
- local id = start.id
- if id == glyph_code then
- if start.subtype<256 and start.font == font then
- local a = has_attribute(start,0)
- if a then
- a = a == attr
- else
- a = true
- end
- if a then
- for i=1,#subtables do
- local lookupname = subtables[i]
- local lookupcache = lookuphash[lookupname]
- if lookupcache then
- local lookupmatch = lookupcache[start.char]
- if lookupmatch then
- start, success = handler(start,dataset[4],lookupname,lookupmatch,sequence,lookuphash,i)
- if success then
- break
- end
- end
- else
- report_missing_cache(typ,lookupname)
- end
- end
- if start then start = start.prev end
- else
- start = start.prev
- end
- else
- start = start.prev
- end
- else
- start = start.prev
- end
- end
- else
- local handler = handlers[typ]
- local ns = #subtables
- local start = head -- local ?
- rlmode = 0 -- to be checked ?
- if ns == 1 then -- happens often
- local lookupname = subtables[1]
- local lookupcache = lookuphash[lookupname]
- if not lookupcache then -- also check for empty cache
- report_missing_cache(typ,lookupname)
- else
- while start do
- local id = start.id
- if id == glyph_code then
- if start.subtype<256 and start.font == font then
- local a = has_attribute(start,0)
- if a then
- a = (a == attr) and (not attribute or has_attribute(start,state,attribute))
- else
- a = not attribute or has_attribute(start,state,attribute)
- end
- if a then
- local lookupmatch = lookupcache[start.char]
- if lookupmatch then
- -- sequence kan weg
- local ok
- start, ok = handler(start,dataset[4],lookupname,lookupmatch,sequence,lookuphash,1)
- if ok then
- success = true
- end
- end
- if start then start = start.next end
- else
- start = start.next
- end
- else
- start = start.next
- end
- elseif id == whatsit_code then -- will be function
- local subtype = start.subtype
- if subtype == dir_code then
- local dir = start.dir
- if dir == "+TRT" or dir == "+TLT" then
- topstack = topstack + 1
- dirstack[topstack] = dir
- elseif dir == "-TRT" or dir == "-TLT" then
- topstack = topstack - 1
- end
- local newdir = dirstack[topstack]
- if newdir == "+TRT" then
- rlmode = -1
- elseif newdir == "+TLT" then
- rlmode = 1
- else
- rlmode = rlparmode
- end
- if trace_directions then
- report_process("directions after txtdir %s: txtdir=%s:%s, parmode=%s, txtmode=%s",dir,topstack,newdir or "unset",rlparmode,rlmode)
- end
- elseif subtype == localpar_code then
- local dir = start.dir
- if dir == "TRT" then
- rlparmode = -1
- elseif dir == "TLT" then
- rlparmode = 1
- else
- rlparmode = 0
- end
- rlmode = rlparmode
- if trace_directions then
- report_process("directions after pardir %s: parmode=%s, txtmode=%s",dir,rlparmode,rlmode)
- end
- end
- start = start.next
- else
- start = start.next
- end
- end
- end
- else
- while start do
- local id = start.id
- if id == glyph_code then
- if start.subtype<256 and start.font == font then
- local a = has_attribute(start,0)
- if a then
- a = (a == attr) and (not attribute or has_attribute(start,state,attribute))
- else
- a = not attribute or has_attribute(start,state,attribute)
- end
- if a then
- for i=1,ns do
- local lookupname = subtables[i]
- local lookupcache = lookuphash[lookupname]
- if lookupcache then
- local lookupmatch = lookupcache[start.char]
- if lookupmatch then
- -- we could move all code inline but that makes things even more unreadable
- local ok
- start, ok = handler(start,dataset[4],lookupname,lookupmatch,sequence,lookuphash,i)
- if ok then
- success = true
- break
- end
- end
- else
- report_missing_cache(typ,lookupname)
- end
- end
- if start then start = start.next end
- else
- start = start.next
- end
- else
- start = start.next
- end
- elseif id == whatsit_code then
- local subtype = start.subtype
- if subtype == dir_code then
- local dir = start.dir
- if dir == "+TRT" or dir == "+TLT" then
- topstack = topstack + 1
- dirstack[topstack] = dir
- elseif dir == "-TRT" or dir == "-TLT" then
- topstack = topstack - 1
- end
- local newdir = dirstack[topstack]
- if newdir == "+TRT" then
- rlmode = -1
- elseif newdir == "+TLT" then
- rlmode = 1
- else
- rlmode = rlparmode
- end
- if trace_directions then
- report_process("directions after txtdir %s: txtdir=%s:%s, parmode=%s, txtmode=%s",dir,topstack,newdir or "unset",rlparmode,rlmode)
- end
- elseif subtype == localpar_code then
- local dir = start.dir
- if dir == "TRT" then
- rlparmode = -1
- elseif dir == "TLT" then
- rlparmode = 1
- else
- rlparmode = 0
- end
- rlmode = rlparmode
- if trace_directions then
- report_process("directions after pardir %s: parmode=%s, txtmode=%s",dir,rlparmode,rlmode)
- end
- end
- start = start.next
- else
- start = start.next
- end
- end
- end
- end
- if success then
- done = true
- end
- if trace_steps then -- ?
- registerstep(head)
- end
- end
- end
- end
- return head, done
-end
-
-local function generic(lookupdata,lookupname,unicode,lookuphash)
- local target = lookuphash[lookupname]
- if target then
- target[unicode] = lookupdata
- else
- lookuphash[lookupname] = { [unicode] = lookupdata }
- end
-end
-
-local action = {
-
- substitution = generic,
- multiple = generic,
- alternate = generic,
- position = generic,
-
- ligature = function(lookupdata,lookupname,unicode,lookuphash)
- local target = lookuphash[lookupname]
- if not target then
- target = { }
- lookuphash[lookupname] = target
- end
- for i=1,#lookupdata do
- local li = lookupdata[i]
- local tu = target[li]
- if not tu then
- tu = { }
- target[li] = tu
- end
- target = tu
- end
- target.ligature = unicode
- end,
-
- pair = function(lookupdata,lookupname,unicode,lookuphash)
- local target = lookuphash[lookupname]
- if not target then
- target = { }
- lookuphash[lookupname] = target
- end
- local others = target[unicode]
- local paired = lookupdata[1]
- if others then
- others[paired] = lookupdata
- else
- others = { [paired] = lookupdata }
- target[unicode] = others
- end
- end,
-
-}
-
-local function prepare_lookups(tfmdata)
-
- local rawdata = tfmdata.shared.rawdata
- local resources = rawdata.resources
- local lookuphash = resources.lookuphash
- local anchor_to_lookup = resources.anchor_to_lookup
- local lookup_to_anchor = resources.lookup_to_anchor
- local lookuptypes = resources.lookuptypes
- local characters = tfmdata.characters
- local descriptions = tfmdata.descriptions
-
- -- we cannot free the entries in the descriptions as sometimes we access
- -- then directly (for instance anchors) ... selectively freeing does save
- -- much memory as it's only a reference to a table and the slot in the
- -- description hash is not freed anyway
-
- for unicode, character in next, characters do -- we cannot loop over descriptions !
-
- local description = descriptions[unicode]
-
- if description then
-
- local lookups = description.slookups
- if lookups then
- for lookupname, lookupdata in next, lookups do
- action[lookuptypes[lookupname]](lookupdata,lookupname,unicode,lookuphash)
- end
- end
-
- local lookups = description.mlookups
- if lookups then
- for lookupname, lookuplist in next, lookups do
- local lookuptype = lookuptypes[lookupname]
- for l=1,#lookuplist do
- local lookupdata = lookuplist[l]
- action[lookuptype](lookupdata,lookupname,unicode,lookuphash)
- end
- end
- end
-
- local list = description.kerns
- if list then
- for lookup, krn in next, list do -- ref to glyph, saves lookup
- local target = lookuphash[lookup]
- if target then
- target[unicode] = krn
- else
- lookuphash[lookup] = { [unicode] = krn }
- end
- end
- end
-
- local list = description.anchors
- if list then
- for typ, anchors in next, list do -- types
- if typ == "mark" or typ == "cexit" then -- or entry?
- for name, anchor in next, anchors do
- local lookups = anchor_to_lookup[name]
- if lookups then
- for lookup, _ in next, lookups do
- local target = lookuphash[lookup]
- if target then
- target[unicode] = anchors
- else
- lookuphash[lookup] = { [unicode] = anchors }
- end
- end
- end
- end
- end
- end
- end
-
- end
-
- end
-
-end
-
-local function split(replacement,original)
- local result = { }
- for i=1,#replacement do
- result[original[i]] = replacement[i]
- end
- return result
-end
-
--- not shared as we hook into lookups now
-
---~ local function uncover_1(covers,result) -- multiple covers
---~ local nofresults = #result
---~ for n=1,#covers do
---~ nofresults = nofresults + 1
---~ local u = { }
---~ local c = covers[n]
---~ for i=1,#c do
---~ u[c[i]] = true
---~ end
---~ result[nofresults] = u
---~ end
---~ end
-
---~ local function uncover_2(covers,result) -- single covers (turned into multiple with n=1)
---~ local nofresults = #result
---~ for n=1,#covers do
---~ nofresults = nofresults + 1
---~ result[nofresults] = { [covers[n]] = true }
---~ end
---~ end
-
---~ local function uncover_1(covers,result) -- multiple covers
---~ local nofresults = #result
---~ for n=1,#covers do
---~ nofresults = nofresults + 1
---~ result[nofresults] = covers[n]
---~ end
---~ end
-
---~ local function prepare_contextchains(tfmdata)
---~ local rawdata = tfmdata.shared.rawdata
---~ local resources = rawdata.resources
---~ local lookuphash = resources.lookuphash
---~ local lookups = rawdata.lookups
---~ if lookups then
---~ for lookupname, lookupdata in next, rawdata.lookups do
---~ local lookuptype = lookupdata.type
---~ if not lookuptype then
---~ report_prepare("missing lookuptype for %s",lookupname)
---~ else -- => lookuphash[lookupname][unicode]
---~ local rules = lookupdata.rules
---~ if rules then
---~ local fmt = lookupdata.format
---~ -- if fmt == "coverage" then
---~ if fmt == "coverage" or fmt == "glyphs" then
---~ if lookuptype ~= "chainsub" and lookuptype ~= "chainpos" then
---~ -- todo: dejavu-serif has one (but i need to see what use it has)
---~ report_prepare("unsupported coverage %s for %s",lookuptype,lookupname)
---~ else
---~ local contexts = lookuphash[lookupname]
---~ if not contexts then
---~ contexts = { }
---~ lookuphash[lookupname] = contexts
---~ end
---~ local t, nt = { }, 0
---~ for nofrules=1,#rules do -- does #rules>1 happen often?
---~ local rule = rules[nofrules]
---~ local current = rule.current
---~ local before = rule.before
---~ local after = rule.after
---~ local sequence = { }
---~ if before then
---~ uncover_1(before,sequence)
---~ end
---~ local start = #sequence + 1
---~ uncover_1(current,sequence)
---~ local stop = #sequence
---~ if after then
---~ uncover_1(after,sequence)
---~ end
---~ if sequence[1] then
---~ nt = nt + 1
---~ t[nt] = { nofrules, lookuptype, sequence, start, stop, rule.lookups }
---~ for unic, _ in next, sequence[start] do
---~ local cu = contexts[unic]
---~ if not cu then
---~ contexts[unic] = t
---~ end
---~ end
---~ end
---~ end
---~ end
---~ elseif fmt == "reversecoverage" then -- we could combine both branches (only dufference is replacements)
---~ if lookuptype ~= "reversesub" then
---~ report_prepare("unsupported reverse coverage %s for %s",lookuptype,lookupname)
---~ else
---~ local contexts = lookuphash[lookupname]
---~ if not contexts then
---~ contexts = { }
---~ lookuphash[lookupname] = contexts
---~ end
---~ local t, nt = { }, 0
---~ for nofrules=1,#rules do
---~ local rule = rules[nofrules]
---~ local current = rule.current
---~ local before = rule.before
---~ local after = rule.after
---~ local replacements = rule.replacements
---~ local sequence = { }
---~ if before then
---~ uncover_1(before,sequence)
---~ end
---~ local start = #sequence + 1
---~ uncover_1(current,sequence)
---~ local stop = #sequence
---~ if after then
---~ uncover_1(after,sequence)
---~ end
---~ if sequence[1] then
---~ nt = nt + 1
---~ t[nt] = { nofrules, lookuptype, sequence, start, stop, rule.lookups, replacements }
---~ for unic, _ in next, sequence[start] do
---~ local cu = contexts[unic]
---~ if not cu then
---~ contexts[unic] = t
---~ end
---~ end
---~ end
---~ end
---~ end
---~ -- elseif fmt == "glyphs" then --maybe just make then before = { fore } and share with coverage
---~ -- if lookuptype ~= "chainsub" and lookuptype ~= "chainpos" then
---~ -- report_prepare("unsupported coverage %s for %s",lookuptype,lookupname)
---~ -- else
---~ -- local contexts = lookuphash[lookupname]
---~ -- if not contexts then
---~ -- contexts = { }
---~ -- lookuphash[lookupname] = contexts
---~ -- end
---~ -- local t, nt = { }, 0
---~ -- for nofrules=1,#rules do -- we can make glyphs a special case (less tables)
---~ -- local rule = rules[nofrules]
---~ -- local current = rule.names
---~ -- local before = rule.fore
---~ -- local after = rule.back
---~ -- local sequence = { }
---~ -- if before then
---~ -- uncover_1(before,sequence)
---~ -- end
---~ -- local start = #sequence + 1
---~ -- uncover_1(current,sequence)
---~ -- local stop = #sequence
---~ -- if after then
---~ -- uncover_1(after,sequence)
---~ -- end
---~ -- if sequence then
---~ -- nt = nt + 1
---~ -- t[nt] = { nofrules, lookuptype, sequence, start, stop, rule.lookups }
---~ -- for unic, _ in next, sequence[start] do
---~ -- local cu = contexts[unic]
---~ -- if not cu then
---~ -- contexts[unic] = t
---~ -- end
---~ -- end
---~ -- end
---~ -- end
---~ -- end
---~ end
---~ end
---~ end
---~ end
---~ end
---~ end
-
-local valid = {
- coverage = { chainsub = true, chainpos = true, contextsub = true },
- reversecoverage = { reversesub = true },
- glyphs = { chainsub = true, chainpos = true },
-}
-
-local function prepare_contextchains(tfmdata)
- local rawdata = tfmdata.shared.rawdata
- local resources = rawdata.resources
- local lookuphash = resources.lookuphash
- local lookups = rawdata.lookups
- if lookups then
- for lookupname, lookupdata in next, rawdata.lookups do
- local lookuptype = lookupdata.type
- if lookuptype then
- local rules = lookupdata.rules
- if rules then
- local format = lookupdata.format
- local validformat = valid[format]
- if not validformat then
- report_prepare("unsupported format %s",format)
- elseif not validformat[lookuptype] then
- -- todo: dejavu-serif has one (but i need to see what use it has)
- report_prepare("unsupported %s %s for %s",format,lookuptype,lookupname)
- else
- local contexts = lookuphash[lookupname]
- if not contexts then
- contexts = { }
- lookuphash[lookupname] = contexts
- end
- local t, nt = { }, 0
- for nofrules=1,#rules do
- local rule = rules[nofrules]
- local current = rule.current
- local before = rule.before
- local after = rule.after
- local replacements = rule.replacements
- local sequence = { }
- local nofsequences = 0
- -- Wventually we can store start, stop and sequence in the cached file
- -- but then less sharing takes place so best not do that without a lot
- -- of profiling so let's forget about it.
- if before then
- for n=1,#before do
- nofsequences = nofsequences + 1
- sequence[nofsequences] = before[n]
- end
- end
- local start = nofsequences + 1
- for n=1,#current do
- nofsequences = nofsequences + 1
- sequence[nofsequences] = current[n]
- end
- local stop = nofsequences
- if after then
- for n=1,#after do
- nofsequences = nofsequences + 1
- sequence[nofsequences] = after[n]
- end
- end
- if sequence[1] then
- -- Replacements only happen with reverse lookups as they are single only. We
- -- could pack them into current (replacement value instead of true) and then
- -- use sequence[start] instead but it's somewhat ugly.
- nt = nt + 1
- t[nt] = { nofrules, lookuptype, sequence, start, stop, rule.lookups, replacements }
- for unic, _ in next, sequence[start] do
- local cu = contexts[unic]
- if not cu then
- contexts[unic] = t
- end
- end
- end
- end
- end
- else
- -- no rules
- end
- else
- report_prepare("missing lookuptype for %s",lookupname)
- end
- end
- end
-end
-
--- we can consider lookuphash == false (initialized but empty) vs lookuphash == table
-
-local function featuresinitializer(tfmdata,value)
- if true then -- value then
- -- beware we need to use the topmost properties table
- local rawdata = tfmdata.shared.rawdata
- local properties = rawdata.properties
- if not properties.initialized then
- local starttime = trace_preparing and os.clock()
- local resources = rawdata.resources
- resources.lookuphash = resources.lookuphash or { }
- prepare_contextchains(tfmdata)
- prepare_lookups(tfmdata)
- properties.initialized = true
- if trace_preparing then
- report_prepare("preparation time is %0.3f seconds for %s",os.clock()-starttime,tfmdata.properties.fullname or "?")
- end
- end
- end
-end
-
-registerotffeature {
- name = "features",
- description = "features",
- default = true,
- initializers = {
- position = 1,
- node = featuresinitializer,
- },
- processors = {
- node = featuresprocessor,
- }
-}